Quote:
Originally posted by SVX10
what is the role of the ball joint? I think the boot around one of mine broke and let the grease out, but i've never fixed it. Would it cause front end noise or bad tire wear or anything like that?
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The ball joint fixes the bottom of the upright to the end of the control arm. It's a universal joint (like the one in your shoulder or hip) that allows the wheel the travel up and down and turn left to right.
When the front right ball joint in my wife's Legacy went bad, the most pronounced symptom was a wobbling noise (and eventually a shaking of the steering wheel) while turning left on the freeway.